MGP36450 - 450 Amp Circuit Breaker

MGP36450 - 450 Amp Circuit Breaker

The MGP36450 is a 450 amp, 3-pole circuit breaker for electrical distribution applications where the breaker's ratings, trip characteristics, connections, and physical size must match the equipment—not just the label. For replacement work in your existing or legacy equipment, its 450A rating, three-pole configuration, ET 1.0 trip unit, interrupting ratings, conductor requirements, connections, and dimensions provide the practical information needed to evaluate form, fit, and function. Solid construction lasts when selected, installed, and maintained correctly.

Key Features and Benefits

• 450 Amp Rating: The MGP36450 carries a 450A line-rated current for compatible distribution equipment.
• Three-Pole Configuration: A 3-pole design provides another essential checkpoint when matching an existing breaker.
• ET 1.0 Electronic Trip Unit: Uses a basic electronic ET 1.0 trip unit rather than leaving trip technology open to interpretation.
• Long-Time Pickup Adjustment: Manufacturer specifications list a 300–800A long-time pickup adjustment range.
• Specified Magnetic Tripping Current: Rated at 900–4,500A.
• 80% Continuous Current Rating: The continuous-current rating is explicitly specified at 80%.
• Line and Load Connections Identified: The breaker uses terminal nuts on the line side and lugs on the load side, an important distinction when checking an existing installation.
• AL800M23K Load-Side Lugs: The specified conductor range is 3 x 3/0 AWG through 3 x 500 kcmil aluminum or copper.
• Push-to-Trip Function: An integral push-to-trip button allows manual tripping.

Technical Specifications

• Catalog Number: MGP36450
  
• Product Type: Circuit Breaker
  
• Product Family: PowerPact M
  
• Device Application: Distribution
  
• Line Rated Current: 450A
  
• Number of Poles: 3
  
• Rated Operational Voltage: 600VAC, 50/60Hz, UL 489
  
• Network Frequency: 50/60Hz
  
• Breaking Capacity Code: G
  
• UL 489 AIR at 240VAC: 65kA
  
• UL 489 AIR at 480VAC: 35kA
  
• UL 489 AIR at 600VAC: 18kA
  
• IEC 60947-2 Icu at 240VAC: 50kA
  
• IEC 60947-2 Icu at 380/415VAC: 35kA
  
• IEC 60947-2 Ics at 240VAC: 25kA
  
• IEC 60947-2 Ics at 380/415VAC: 20kA
  
• Trip Unit Technology: Electronic, basic, ET 1.0
  
• Trip Unit Name: ET 1.0
  
• Long-Time Pickup Adjustment Range: 300–800A
  
• Magnetic Tripping Current: 900–4,500A
  
• Continuous Current Rating: 80%
  
• Rated Insulation Voltage: 750V, IEC 60947-2
  
• Line-Side Electrical Connection: Terminal nut
  
• Load-Side Electrical Connection: Lugs
  
• Height: 12.86 in. (326.64 mm)
  
• Width: 8.27 in. (210.06 mm)
  
• Depth: 8.05 in. (204.47 mm)
  
• Net Weight: 29 lb. (13.2 kg)
  
• Circuit Breaker Application: HACR-rated
  

Material Compliance and Certifications

The MGP36450 has manufacturer-documented certification and standards information that can be checked directly against the requirements of the installation:

• Product Certifications: UL, CSA, NOM
• Standards: UL, CSA, NEMA, NOM-003-SCFI-2000, IEC 60947-2
• Quality Label: CE
• HACR Rated: Yes
• IP Degree of Protection: IP40

Where It Works Best

The MGP36450 450A circuit breaker is best evaluated for compatible electrical distribution equipment requiring a 450-amp, 3-pole breaker rated for operation up to 600VAC at 50/60Hz, along with the specified ET 1.0 electronic trip configuration. It's particularly important to match the connection arrangement on this model because the supplied configuration is terminal nuts on the line side and AL800M23K lugs on the load side.

Fault-current requirements deserve the same attention. The MGP36450 is rated under UL 489 for 65kA AIR at 240VAC, 35kA AIR at 480VAC, and 18kA AIR at 600VAC. Check those ratings against the available fault current and other requirements of the actual installation.